That is great that you are doing this. Cause at the moment I had carried out biological research on the wave lengths and PAR wattage required (I just can't really convert enrgy of light in to photon flux). Apparently we do need leds higher than 640, especially wee must have 680nm and 700nm as theese wave lengths affect photosythetic rate and photomorphogenesis of the plant.
So these are the wave lengths I have discovered are preferable to have.

420
430
440
450
460

620
630
640
650
660
670
680
700

720 (optional)
We need to maintain approximately the same light energy power output on each wavelength.
Total light energy power should be around 350 Watts per meter sq (500 PAR (photosynthetic active radiation) watts for eqatorial sun).
Also you may have a look at my link in signature. There you may find spectras for chlorophyll a and b and carotenoids.
cture Reviewed by cture on . Building LED lights from facts, no theories I was going to post this at the Perfect LED Grow Light thread, but as some of what im going to post was posted 2 years ago on the stickied thread about LEDs and people still continue developing lights from wrong ideas, i think a thread about this topic is largelly needed. The main problem is related to efficacy of spectrums. When the firsts LED experiments at Overgrow, we work on the hypothesis that blue and red light are more effective. It was an appealing hypothesis that promises large Rating: 5